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"The Bulletins, Professional papers, and Water-supply papers ... have been classified into the following series: A, Economic geology; B, Descriptive geology; C, Systematic geology and paleontology; D, Petrology and mineralogy; E, Chemistry and physics; F, Geography; G, Miscellaneous; H, Forestry; I, Irrigation; J, Water Storage; K, Pumping water; L, Quality of water; M, Methods of hydrographic investigations; N, Water power; O, Underground waters; P, Hydrographic progress reports."
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